Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752452AbdGFVPu (ORCPT ); Thu, 6 Jul 2017 17:15:50 -0400 Received: from cloudserver094114.home.net.pl ([79.96.170.134]:44235 "EHLO cloudserver094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751899AbdGFVPt (ORCPT ); Thu, 6 Jul 2017 17:15:49 -0400 From: "Rafael J. Wysocki" To: Juri Lelli Cc: peterz@infradead.org, mingo@redhat.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, tglx@linutronix.de, vincent.guittot@linaro.org, rostedt@goodmis.org, luca.abeni@santannapisa.it, claudio@evidence.eu.com, tommaso.cucinotta@santannapisa.it, bristot@redhat.com, mathieu.poirier@linaro.org, tkjos@android.com, joelaf@google.com, andresoportus@google.com, morten.rasmussen@arm.com, dietmar.eggemann@arm.com, patrick.bellasi@arm.com Subject: Re: [RFC PATCH v1 0/8] SCHED_DEADLINE freq/cpu invariance and OPP selection Date: Thu, 06 Jul 2017 23:08:12 +0200 Message-ID: <2630896.M7AEhLILWO@aspire.rjw.lan> User-Agent: KMail/4.14.10 (Linux/4.12.0-rc1+; KDE/4.14.9; x86_64; ; ) In-Reply-To: <20170705085905.6558-1-juri.lelli@arm.com> References: <20170705085905.6558-1-juri.lelli@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3056 Lines: 74 On Wednesday, July 05, 2017 09:58:57 AM Juri Lelli wrote: > Hi, > > v1 of the RFC set implementing frequency/cpu invariance and OPP selection for > SCHED_DEADLINE [1]. The set is based on tip/sched/core as of today > (72298e5c92c5), which now already includes Luca's "CPU reclaiming for > SCHED_DEADLINE". > > Thanks a lot for reviewing RFCv0! > > Patches high level description: > > o [01-02]/08 add the necessary links to start accounting DEADLINE contribution > to OPP selection > o 03/08 it's a temporary solution to make possible (on ARM) to change > frequency for DEADLINE tasks (that would possibly delay the SCHED_FIFO > worker kthread); proper solution would be to be able to issue frequency > transition from an atomic ctx > o [04-05]/08 it's a schedutil change that copes with the fact that DEADLINE > doesn't require periodic OPP selection triggering point > o [06-07]/08 make arch_scale_{freq,cpu}_capacity() function available on !CONFIG_SMP > configurations too > o 08/08 implements frequency/cpu invariance for tasks' reservation > parameters; which basically means that we implement GRUB-PA [2] > > Changes w.r.t. RFCv0: > > - rebase on tip/sched/core > - make use of BW_SHIFT for calculations (Peter) > - added a comment about guaranteed/requested frequency (Peter) > - use a high bit for sched_flags SCHED_FLAG_SPECIAL hack; don't expose it to > userspace and add comments (Peter) > - refactor aggregation of utilization from scheduling classes > > Please have a look. Feedback and comments are, as usual, more than welcome. > > In case you would like to test this out: > > git://linux-arm.org/linux-jl.git upstream/deadline/freq-rfc-v1 > > Best, > > - Juri > > > Juri Lelli (8): > sched/cpufreq_schedutil: make use of DEADLINE utilization signal > sched/deadline: move cpu frequency selection triggering points > sched/cpufreq_schedutil: make worker kthread be SCHED_DEADLINE > sched/cpufreq_schedutil: split utilization signals > sched/cpufreq_schedutil: always consider all CPUs when deciding next > freq > sched/sched.h: remove sd arch_scale_freq_capacity parameter > sched/sched.h: move arch_scale_{freq,cpu}_capacity outside CONFIG_SMP > sched/deadline: make bandwidth enforcement scale-invariant > > include/linux/sched.h | 1 + > include/linux/sched/cpufreq.h | 2 -- > include/linux/sched/topology.h | 12 +++---- > kernel/sched/core.c | 15 ++++++-- > kernel/sched/cpufreq_schedutil.c | 77 ++++++++++++++++++++++++++-------------- > kernel/sched/deadline.c | 46 ++++++++++++++++++++---- > kernel/sched/fair.c | 4 +-- > kernel/sched/sched.h | 51 +++++++++++++++++++------- > 8 files changed, 149 insertions(+), 59 deletions(-) The schedutil changes in this series look OK to me, so please feel free to add Acked-by: Rafael J. Wysocki to these patches. Thanks, Rafael